Fix inference with fft

[Ivang71]

Currently running infer_fft.py fails with the following error

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/scepter/modules/utils/registry.py", line 85, in build_from_config
    return req_type_entry(cfg, logger=logger, *args, **kwargs)
  File "/workspace/dtback/ACE_plus/modules/ace_plus_ldm.py", line 21, in __init__
    super().__init__(cfg, logger=logger)
  File "/usr/local/lib/python3.10/dist-packages/scepter/modules/model/network/ldm/ldm.py", line 91, in __init__
    self.construct_network()
  File "/workspace/dtback/ACE_plus/modules/ace_plus_ldm.py", line 78, in construct_network
    self.first_stage_model = MODELS.build(self.first_stage_config,
  File "/usr/local/lib/python3.10/dist-packages/scepter/modules/utils/registry.py", line 142, in build
    return self.build_func(cfg,
  File "/usr/local/lib/python3.10/dist-packages/scepter/modules/model/registry.py", line 26, in build_model
    model.load_pretrained_model(pretrain_cfg)
  File "/usr/local/lib/python3.10/dist-packages/scepter/modules/model/network/autoencoder/ae_kl.py", line 366, in load_pretrained_model
    with FS.get_from(pretrained_model, wait_finish=True) as local_model:
  File "/usr/local/lib/python3.10/dist-packages/scepter/modules/utils/file_system.py", line 245, in get_from
    local_path = client.get_object_to_local_file(
  File "/usr/local/lib/python3.10/dist-packages/scepter/modules/utils/file_clients/huggingface_fs.py", line 49, in get_object_to_local_file
    key, file_path = key.split('@', 1)
ValueError: not enough values to unpack (expected 2, got 1)

this pr fixes the problem

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